Side safety air curtain device and manufacturing method thereof

Abstract

The present invention discloses a side safety air curtain device, comprising an air bag body and an air guide cloth, wherein the interior of the air bag body is a cavity structure, and the air guide cloth is composed of a base cloth folded downward; wherein the air guide cloth is located in the cavity of the air bag body, and the lower edge of the air guide cloth is sewn together with the air bag body to form an air guide channel in the air guide cloth. In addition, the present invention also discloses a method for manufacturing a side safety air curtain device. The beneficial effects of the present invention are as follows: the air guide cloth of the side safety air curtain device is composed of a base cloth folded downward, so the gas flowing into the air guide channel will not enter the upper end of the air bag body, so that the entire side safety air curtain device has better air tightness; and the gas entering the side safety air curtain device can be controlled by changing the distance and shape of the stitches A and B, and distributed between the chambers and the direction of the gas flowing into the chambers can be controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of side safety air curtains equipped on vehicles such as automobiles, and in particular to a side safety air curtain device and a manufacturing method thereof. Background Art

[0002] At present, for the side head side safety air curtain devices equipped on vehicles such as automobiles, front and rear cavity air guide channels are set so that the front and rear cavities can be inflated at the same time to achieve pressure balance.

[0003] However, the side air curtain devices in the prior art mainly have the following shortcomings:

[0004] 1. The air guide cloth is fixed by the upper seam of the airbag body. When the side air curtain device is just deployed, due to the high pressure in the air guide channel formed by the air guide cloth, too much gas will flow out of the side air curtain device through the pinholes in the upper seam, reducing the protection effect on the occupants.

[0005] 2. During the deployment of the side safety air curtain device, circular holes are opened on the air guide cloth to distribute gas to the front and rear cavities. However, due to the high pressure in the air guide channel during the deployment process, the originally set circular holes become larger or deformed due to the damage of the base cloth wire, resulting in unstable gas distribution.

[0006] 3. By opening circular holes in the gas guide cloth to distribute the gas to the front and rear chambers, the direction in which the gas flows into each chamber cannot be controlled, resulting in limited protection effect. Summary of the invention

[0007] In order to solve the technical defects of the side safety air curtain device in the prior art, such as poor air tightness, unstable gas distribution and uncontrollable direction of gas flowing into each chamber, the present invention provides a side safety air curtain device, which can improve the air tightness of the side safety air curtain device and can control the gas distribution and the direction of gas flowing into each chamber.

[0008] To achieve the above object, the technical solution adopted by the present invention is:

[0009] A side safety air curtain device comprises an air bag body and an air guide cloth, wherein the interior of the air bag body is a cavity structure, and the air guide cloth is composed of a base cloth folded downward; wherein the air guide cloth is located in the cavity of the air bag body, and the air guide cloth and the air bag body are sewn together to form an air guide channel in the air guide cloth. The air guide cloth is located at the upper left part of the air bag body.

[0010] The air guide cloth of the side safety air curtain device is composed of a base cloth folded downward, so the inflowing gas will not enter the upper end of the air bag body, so that the entire side safety air curtain device has better air tightness.

[0011] Preferably, the lower edge of the air guide cloth is sewn together with the airbag body by means of a suture A and a suture B. The distance d between two adjacent end points of the suture A and the suture B is 40 mm to 160 mm.

[0012] Preferably, the suture B is in an arc shape. The angle α between the tangent of the suture B at the left end point and the positive direction of the X axis is 55° to 105°. In other words, the distance between the suture A and the suture B and the shapes of the suture A and the suture B can be set according to actual needs.

[0013] The opening portion of the air guide cloth between the stitches A and B forms a vent X. The opening portion of the air guide cloth between the upper edge of the air guide cloth and the stitches B forms a vent Y. The distance between the stitches A and B and the shapes of the stitches A and B can be set according to actual needs, so by changing the distance between the stitches A and B, the size of the vent X and the vent Y can be changed, and the gas distribution amount in the front and rear cavities of the side safety air curtain device can be further controlled. At the same time, by changing the shapes of the stitches A and B, the direction in which the gas flows into the front and rear cavities of the side safety air curtain device can also be controlled.

[0014] Preferably, the airbag body is a bag body formed by sewing the edge parts of the main fabric piece a and the main fabric piece b of the same structure. The airbag body is composed of the main fabric piece a and the main fabric piece b arranged symmetrically, which has the advantages of saving base fabric and improving the utilization rate of scraps compared to the airbag body composed of a whole piece of base fabric.

[0015] Preferably, the middle part of the airbag body is sewn at the right lower position of the suture B by a quasi-rectangular suture. The right end of the airbag body is sewn by a quasi-U-shaped suture. Gas will not be filled into the quasi-rectangular suture, which can save the gas filling amount of the entire airbag body. At the same time, the quasi-U-shaped suture at the right end of the airbag body can also reduce the amount of gas filled into the airbag body. Therefore, the quasi-rectangular suture and the quasi-U-shaped suture can reduce the cost of the gas generator used with the airbag body.

[0016] Preferably, the lower edge of the air guide cloth is sewn together with the airbag body through suture E, suture B and suture C.

[0017] Preferably, the edge of the left end of the airbag body is sewn by an open stitch D.

[0018] Preferably, the suture E and the suture D are one suture formed by sewing at one time.

[0019] Preferably, the middle portion of the left end of the airbag body is sewn with an S-shaped suture.

[0020] A method for manufacturing a side safety air curtain device comprises the following steps: (A) cutting a base fabric to obtain a main fabric piece a, a main fabric piece and an air guide fabric; (B) placing the air guide fabric piece on the main fabric piece a; (C) folding the air guide fabric downward; (D) placing the main fabric piece b on the folded air guide fabric; and (E) sewing all the seams on the main fabric pieces a, b and the air guide fabric at one time.

[0021] Preferably, in step (A), the angle of the threads of the air-conducting cloth is β=20°~70°. The angle of the threads of the air-conducting cloth is β=20°~70°. The air-conducting cloth within the above angle range can withstand greater gas pressure.

[0022] Preferably, after step (B), step (C) and step (D), the method for manufacturing the side safety air curtain device further includes a positioning step through a preset positioning hole.

[0023] The beneficial effects of the present invention are as follows: the air guide cloth of the side air curtain device is composed of a base cloth folded downward, so the gas flowing into the air guide channel will not enter the upper end of the airbag body, so that the entire side air curtain device has good air tightness; the size and position of the vent X and the vent Y will be naturally formed and changed at will according to the difference between the suture A and the suture B, so by changing the distance between the suture A and the suture B and the shape of the suture A and the suture B, the size of the vent X and the vent Y can be changed, so as to further control the gas distribution amount in the front and rear cavities of the side air curtain device. By changing the shape of the suture A and the suture B, the direction of gas inflow can also be controlled; the side air curtain device also has the beneficial effects of small folding volume and low transportation cost. The side air curtain device of the present invention is also suitable for three-row side air curtains. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of a side safety air curtain device according to a first embodiment of the present invention;

[0025] Figure 2 It is a schematic diagram of the side safety air curtain device of the first embodiment of the present invention when used in conjunction with a gas generator;

[0026] Figure 3 for Figure 2 AA cross-sectional view;

[0027] Figure 4 A schematic structural diagram of a side safety air curtain device according to a first embodiment of the present invention;

[0028] Figure 5It is a schematic structural diagram of the air guide cloth before being folded downwards according to the first embodiment of the present invention;

[0029] Figure 6 It is a schematic structural diagram of the main cloth piece a and the air guide cloth before being folded downwards according to the first embodiment of the present invention;

[0030] Figure 7 It is a schematic structural diagram of the main fabric piece a and the air guide fabric folded downwards in the first embodiment of the present invention;

[0031] Figure 8 It is a schematic structural diagram of the main fabric piece a, the main fabric piece b and the air guide fabric before being sewn together according to the first embodiment of the present invention;

[0032] Fig. 9 It is a schematic structural diagram of the side safety air curtain device after being sewn according to the first embodiment of the present invention;

[0033] Fig.10 A schematic structural diagram of a side safety air curtain device according to a second embodiment of the present invention;

[0034] Fig.11 This is a schematic structural diagram of the air guide cloth according to the second embodiment of the present invention before being folded downward.

[0035] In the figure,

[0036] 1. Airbag body; 11. Main cloth piece a; 12. Main cloth piece b; 13. Quasi-rectangular stitch; 14. Quasi-U-shaped stitch; 15. Upper stitch; 16. Back cavity; 17. Front cavity; 2. Air guide cloth; 21. Stitch A; 22. Stitch B; 23. Vent X; 24. Vent Y; 25. Stitch C; 26. Vent Z; 27. Stitch E; 28. Vent X'; 3. Gas generator; 4. Stitch D; 5. Quasi-S-shaped stitch. DETAILED DESCRIPTION

[0037] The structure of the present invention is explained in detail below with reference to the accompanying drawings.

[0038] like Figures 1 to 4As shown, the side air curtain device provided by the first embodiment of the present invention includes an air bag body 1 and an air guide cloth 2, wherein the interior of the air bag body 1 is a cavity structure, and the air guide cloth 2 is composed of a base cloth folded downward; wherein the air guide cloth 2 is located in the cavity of the air bag body 1, and the lower edge of the air guide cloth 2 is sewn together with the air bag body 1 to form an air guide channel in the air guide cloth 2. The air guide cloth 2 is located at the upper left part of the air bag body 1. The air guide cloth 2 of the side air curtain device is composed of a base cloth folded downward, so the inflowing gas will not enter the upper end of the air bag body 1. Compared with the prior art in which the air guide cloth 2 is folded upward and overlapped with the upper seam 15 of the air bag body 1, causing the gas to flow out of the pinhole at a high speed when the air bag is inflated, it has better air tightness.

[0039] It should be noted that the present invention Figure 1 , Figure 2 as well as Fig. 9 The dotted line shown in the figure represents the air guide cloth 2 folded downward, and the double-dotted line represents the stitching line.

[0040] In the side air curtain device provided by the first embodiment of the present invention, the lower edge of the air guide cloth 2 is sewn together with the air bag body 1 by means of suture A21 and suture B22. The distance d between the two adjacent endpoints of the suture A21 and suture B22 is 40 mm to 160 mm. The suture B22 is in the shape of an arc. The angle α between the tangent of the suture B22 at the left endpoint and the positive direction of the X-axis is 55° to 105°. In other words, the distance between the suture A21 and the suture B22 and the shapes of the suture A21 and the suture B22 can be set according to actual needs.

[0041] In the side air curtain device provided by the first embodiment of the present invention, the opening portion of the air guide cloth 2 between the stitches A21 and B22 forms a vent X23. The opening portion of the air guide cloth 2 between the upper edge of the air guide cloth 2 and the stitches B22 forms a vent Y24. The distance between the stitches A21 and B22 and the shapes of the stitches A21 and B22 can be set according to actual needs, so by changing the distance between the stitches A21 and B22, the size of the vent X23 and the vent Y24 can be changed, and the gas distribution amount of the front and rear chambers 16 and 17 of the side air curtain device can be further controlled. At the same time, by changing the shapes of the stitches A21 and B22, the direction of gas flowing into the front and rear chambers of the side air curtain device can also be controlled.

[0042] The side safety air curtain device provided in the first embodiment of the present invention, the air bag body 1 is a bag body formed by sewing the edge parts of the symmetrically arranged main cloth pieces a11 and b12. It should be noted that when sewing the main cloth pieces a11 and b12, the upper left part does not need to be sewn, and the opening for inflation needs to be retained. The air bag body 1 is composed of the symmetrically arranged main cloth pieces a11 and b12, and compared with the air bag body 1 composed of a whole piece of base cloth, it has the advantages of saving base cloth and improving the utilization rate of scraps.

[0043] In the side air curtain device provided by the first embodiment of the present invention, the middle part of the airbag body 1 located at the lower right position of the suture B22 can be sutured by a quasi-rectangular suture 13. The right end of the airbag body 1 can be sutured by a quasi-U-shaped suture 14. Gas will not be filled inside the quasi-rectangular suture, which can save the gas filling amount of the entire airbag body 1 and reduce the cost of the gas generator 3 used in conjunction with the airbag body 1. It should be noted here that the quasi-rectangular suture 13 and the quasi-U-shaped suture can also be designed as sutures of other shapes according to actual needs.

[0044] The side air curtain device provided by the first embodiment of the present invention can also be connected to a metal air duct, a non-metal air duct or a metal-free air duct on the gas generator 3 when in use. A method for manufacturing a side air curtain device provided by the present invention comprises the following steps: (A) cutting a base fabric to obtain a main fabric piece a11, a main fabric piece b12 and a Figure 5 The air guide cloth 2 of the shape shown in the figure has a thread angle β of 20° to 70°; (B), as Figure 6 As shown, two air guide fabrics are placed on the main fabric a11 and positioned through the preset positioning holes; (C), as shown Figure 7 As shown, the air guide cloth 2 is folded downward and positioned through the preset positioning holes; (D), as Figure 8 As shown, the main cloth piece b12 is placed on the folded air guide cloth 2 and positioned through the preset positioning holes; (E), as Fig. 9 As shown, all the stitches on the main fabric pieces a, b 11, 12 and the air guide fabric 2 are sewn at one time. In step (A), the thread angle β of the present invention refers to Figure 5 The angle between the longitude or latitude of the air guide cloth located in the first quadrant of the flat coordinate system and the positive direction of the Y axis of the flat coordinate system is shown.

[0045] like Figure 10 to Figure 11As shown, the side air curtain device provided by the second embodiment of the present invention is suitable for three-row side air curtains, including an airbag body 1 and an air guide cloth 2, wherein the interior of the airbag body 1 is a cavity structure, and the air guide cloth 2 is composed of a base cloth folded downward; wherein the air guide cloth 2 is located in the cavity of the airbag body 1, and the lower edge of the air guide cloth 2 is sewn together with the airbag body 1 to form an air guide channel in the air guide cloth 2. The lower edge of the air guide cloth 2 is sewn together with the airbag body 1 through stitches E27, stitches B22, and stitches C25. The edge of the left end of the airbag body 1 is sewn through an open stitch D4. The stitches E27 and the stitches D4 are a stitch formed by one-time sewing. The middle of the left end of the airbag body 1 is sewn through an S-shaped stitch 5.

[0046] In the side air curtain device provided by the second embodiment of the present invention, the opening portion of the air guide cloth 2 between the stitching line E27 and the stitching line B22 forms a vent X'28. The opening portion of the air guide cloth 2 between the upper edge of the air guide cloth 2 and the stitching line B22 forms a vent Y24. The opening portion of the stitching line D4 forms a vent Z26.

[0047] The vent X'28, the vent Y24 and the vent Z26 are used to distribute the gas generated by the gas generator 3 to each chamber in different proportions.

[0048] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and simple improvements made to the essential contents of the present invention should be included in the protection scope of the present invention.

Claims

1. A side safety air curtain device, comprising an air bag body (1) and an air guide cloth (2), characterized in that: The air bag body (1) has a hollow structure inside, and the air guide cloth (2) is composed of a base cloth folded downward; wherein: The air guide cloth (2) is located in the cavity of the air bag body (1), and only the lower edge of the air guide cloth (2) is sewn together with the air bag body (1) based on a plurality of stitches to form an air guide channel in the air guide cloth (2), and the plurality of stitches do not overlap with the upper stitches of the air bag body (1) to prevent gas from flowing out of the side safety air curtain device through the pinholes of the upper stitches; The lower edge of the air guide cloth (2) is sewn together with the air bag body (1) by means of a stitch A (21) and a stitch B (22); an opening on the air guide cloth (2) between the stitch A (21) and the stitch B (22) forms a vent X (23) for inflating the front cavity, and an opening on the air guide cloth (2) between the upper edge of the air guide cloth (2) and the stitch B (22) forms a vent Y (24) for inflating the rear cavity; or, the lower edge of the air guide cloth (2) is sewn together with the air bag body (1) by means of a stitch E (27), a stitch B (22) and a stitch C (25); an opening on the air guide cloth (2) between the stitch E (27) and the stitch C (25) forms a vent Y (24) for inflating the rear cavity. The opening portion between the upper edge of the air guide cloth (2) and the stitching line B (22) forms a vent X' (28); the opening portion between the upper edge of the air guide cloth (2) and the stitching line B (22) on the air guide cloth (2) forms a vent Y (24); the opening portion between the stitching line E (27) and the stitching line C (25) forms a vent Z (26); the vent X' (28), the vent Y (24) and the vent Z (26) are used to distribute the gas generated by the gas generator (3) to each chamber in proportion; the middle portion of the air bag body (1) is sewn at the right lower position of the stitching line B (22) by a quasi-rectangular stitching line (13), and the interior of the quasi-rectangular stitching line (13) is not filled with gas; The stitch line B (22) is in an arc shape; by changing the distance between the stitch line A (21) and the stitch line B (22) and the shapes of the stitch line A (21) and the stitch line B (22), the size of the vent hole can be changed, thereby achieving the purpose of controlling the gas distribution amount between the front and rear chambers of the side safety air curtain device, and also controlling the direction of gas inflow.

2. The side air curtain device according to claim 1, characterized in that: The air guide cloth (2) is located at the upper left portion of the air bag body (1).

3. The side air curtain device according to claim 1, characterized in that: The distance d between two adjacent end points of the suture A (21) and the suture B (22) is 40 mm to 160 mm.

4. The side air curtain device according to claim 1, characterized in that: The angle α between the tangent line of the suture line B (22) at the left end point and the positive direction of the X-axis is 55° to 105°.

5. The side air curtain device according to claim 1, characterized in that: The air bag body (1) is a bag body formed by sewing the edge parts of a symmetrically arranged main cloth piece a (11) and a main cloth piece b (12).

6. The side air curtain device according to claim 1, characterized in that: The right end of the airbag body (1) is sewn by a U-shaped suture (14).

7. The side air curtain device according to claim 1, characterized in that: The edge of the left end of the airbag body (1) is sewn by an open seam D (4).

8. The side air curtain device according to claim 7, characterized in that: The suture E (27) and the suture D (4) are one suture formed by sewing at one time.

9. The side air curtain device according to claim 1, characterized in that: The middle part of the left end of the airbag body (1) is sewn by an S-shaped suture (5).

10. A method for manufacturing a side safety air curtain device according to any one of claims 1 to 9, characterized in that: The following steps are involved: (A), cutting the base fabric to obtain a main fabric piece a (11), a main fabric piece b (12) and an air guide fabric (2); (B) placing the air guide cloth (2) on the main cloth piece a (11); (C) Fold the air guide fabric (2) downward; (D) placing the main fabric piece b (12) on the folded air guide fabric (2); (E) All the stitches on the main fabric piece a (11), the main fabric piece b (12) and the air guide fabric (2) are sewn at one time.

11. The method for manufacturing a side air curtain device according to claim 10, characterized in that: In step (A), the thread angle β of the air guide cloth (2) is 20° to 70°.

12. The method for manufacturing a side safety air curtain device according to claim 10, characterized in that: After step (B), step (C) and step (D), the method for manufacturing the side safety air curtain device further includes a positioning step through a preset positioning hole.

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